This thread will be used to present the drawings (both fusion and laser-ready DXF files) for the five parts of the chassis.

As the choice and location of the sensors you choose is one of the “free variables” the drawings will not include any openings for sensors etc. Be reminded that everything you use/attach must be within the footprint of the bot itself, with the exception that you can place something on top - as long as it does not fundamentally alter the design. ( e.g. a rotating scanner of some kind mounted on a micro servo would be OK to fit on top).

Updates :

Spec and order link provided for wheels

Spec and order link provided for Servos and trimpots

Notes :

While links may be provided, feel free to buy your parts anywhere (noting that common, low cost hardware is part of the competition spec). Provision of a link does not infer any endorsement of that supplier, it just means that I got it from there.

There might be an update to the drawings for the chassis to accommodate the revised wheels - I’ll make any necessary changes and post the drawings once final (also DXF files that are Sophia-ready )

The price list (assuming you use the same suppliers as I did)

Wheels : £2.90

Servos : £7.40

Controller - £ down to you but keep it simple !

Sensors : £ - down to you ! (see below for line some line follow sensors as examples)

As stated above, the micro servos felt too flimsy so I have moved to the full-sized item. The servos below are fast and metal-geared so should be fully up to the job. They are not available modified but to rig a pair of these for continuous rotation should only take about 20 minutes - additional parts are required however !

Having now assembled the pieces I cut on 18th Jan, I can confirm that this is the final set of drawings.

Assumptions :

You use the same servos and wheels as in the specification

The servos are fixed using screws only, directly into the openings (none of the regular shock mounting hardware used)

You will need to add some openings for sensors / arrays before cutting.

The archive contains both f3d files that can be edited in fusion and “corrected” DXF files that can be imported on Sophia and cut from birch plywood.

Please note that if you edit the drawings in Fusion, you will need to export the final sketch as a DXF, then open that DXF in Inkscape and save it as a DXF (you can overwrite the original) again in order for it to open properly in the laser software.